50ptexplane every step and show me use the expression 9(7 + 2x) to answer the following: part a: describe the two factors in this expression. (4 points) part b: how many terms are in each factor of this expression? (4 points) part c: what is the coefficient of the variable term? (2 points)

Iknow the answer but the calculator doesn't seem to give the right one

Lisette takes an ela exam and got 16 out of 27 questions correct. what percentage of the questions did lisette get correct?

Arandom sample of 15 observations is used to estimate the population mean. the sample mean and the standard deviation are calculated as 172 and 63, respectively. assume that the population is normally distributed. a. with 99 confidence, what is the margin of error for the estimation of the population mean? b. construct the 99% confidence interval for the population mean. c. construct the 95% confidence interval for the population mean. d. construct the 83% confidence interval for the population mean. hint: you need to use excel function =t. inv.2t to find the value of t for the interval calculation.